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Subject[PATCH v2 3/6] LoongArch: Adjust PC value when unwind next frame in prologue unwinder
Date
When state->first is not set, the PC is a return address in the
previous frame. We need to adjust it value in case overflow to the
next symbol.

Signed-off-by: Jinyang He <hejinyang@loongson.cn>
---
arch/loongarch/kernel/unwind_prologue.c | 6 +++++-
1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/arch/loongarch/kernel/unwind_prologue.c b/arch/loongarch/kernel/unwind_prologue.c
index 3fbb9c65d64e..f7994ed05f04 100644
--- a/arch/loongarch/kernel/unwind_prologue.c
+++ b/arch/loongarch/kernel/unwind_prologue.c
@@ -48,7 +48,7 @@ static bool unwind_by_prologue(struct unwind_state *state)
{
long frame_ra = -1;
unsigned long frame_size = 0;
- unsigned long size, offset, pc = state->pc;
+ unsigned long size, offset, pc;
struct pt_regs *regs;
struct stack_info *info = &state->stack_info;
union loongarch_instruction *ip, *ip_end;
@@ -70,6 +70,10 @@ static bool unwind_by_prologue(struct unwind_state *state)
return true;
}

+ /* When first is not set, the PC is a return address in the previous frame.
+ * We need to adjust it value in case overflow to the next symbol.
+ */
+ pc = state->pc - (state->first ? 0 : LOONGARCH_INSN_SIZE);
if (!kallsyms_lookup_size_offset(pc, &size, &offset))
return false;

--
2.34.3
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